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United States Patent | 5,676,501 |
Peetz ,   et al. | October 14, 1997 |
A drill bit includes a one-piece cylindrical drill bit tube having a longitudinal axis and defining cylindrical surfaces including an inner cylindrical surface and an outer cylindrical surface. At least one of the cylindrical surfaces is configured to include deformations comprising at least one of embossments and recesses, all of the deformations appear over an entire length of the tube. At least some of the deformations are finite over the at least one of the cylindrical surfaces, the deformations further being adapted to stiffen the tube in the longitudinal direction without additional material reinforcements being disposed on the tube. The drill bit further includes hard-metal cutting elements disposed on a front face of the tube.
Inventors: | Peetz; Wolfgang (Fronreute-Blitzenreute, DE); Meyen; Hans-Peter (Wolpertswende, DE) |
Assignee: | Hawera Probst GmbH (Ravensburg, DE) |
Appl. No.: | 629746 |
Filed: | April 9, 1996 |
Apr 27, 1995[DE] | 195 15 435.5 | |
Jan 27, 1996[DE] | 196 02 903.1 |
Current U.S. Class: | 408/204; 408/206; 408/703 |
Intern'l Class: | B23B 051/05 |
Field of Search: | 408/204,144,206,207,224,703 |
1887374 | Nov., 1932 | Emmons | 408/144. |
3382743 | May., 1968 | Trevathan | 408/144. |
3495359 | Feb., 1970 | Smith et al. | 408/204. |
5007777 | Apr., 1991 | Itokazu | 408/206. |
5205685 | Apr., 1993 | Herbert | 408/204. |
5417526 | May., 1995 | Stock et al. | 408/204. |
5429457 | Jul., 1995 | Asano et al. | 408/204. |
Foreign Patent Documents | |||
0295309 | Dec., 1988 | EP. | |
0480263 | Apr., 1992 | EP. | |
2529504 | Jan., 1984 | FR | 408/206. |
2910299 | Sep., 1980 | DE | 408/703. |
3530296 | Mar., 1987 | DE. | |
4242910A1 | Jun., 1994 | DE. | |
03019727 | Jan., 1991 | JP. | |
0585986 | Dec., 1977 | SU | 408/204. |